Litium has a structure
What is the first exited state of litium?
I have some doubt? I think that it is
Is it correct or maybe
Why I'm in problem. Because
wave function of hydrogen atom depends of three quantum numbers

but energy depends only of one quantum number

. So we have degeneration. In this logic it's need to be

. But I don't have hydrogen I have litium, so must be some ecranisation and of course Hund rule

and

orbitals have different energy. And I can say that
Thanks for your answer!